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Carbonate ores are primarily mineral rhodochrosite, rhodochrosite, calcium, manganese, manganese calcite and siderite iron ore; gangue silicate minerals and carbonate minerals, but also frequently with sulfur and iron and other impurities. The composition of the ore is relatively complicated. The size of the manganese mineral inlay is as small as a few microns, which is difficult to dissociate and it is difficult to obtain a higher concentrate grade.
Most of the manganese carbonate ore beneficiation methods use strong magnetic separation, heavy medium ore dressing and flotation. Sedimentary manganese sulfate-containing ores generally employ a sequential preferential flotation process of carbonaceous shale , pyrite and manganese minerals. Hydrothermal manganese ore containing zinc-carbon generally lead flotation - strong magnetic separation process. Some sulfur-rich manganese ore, manganese minerals are mainly sulphur-manganese ore, generally using roasting method to remove sulfur. Some manganese carbonate-rich ores are also produced by roasting to remove volatile components to obtain finished ore.
Manganese carbonate ore contains some refractory ore. Manganese is closely symbiotic with iron, phosphorus or gangue. The size of the inlay is extremely fine and difficult to sort. It can be treated by smelting method. For example, high iron and manganese ore processing high-phosphorus manganese-rich slag, production of activated manganese dioxide and nitric acid leaching of gold electrolytic production method and the like have been used in the case of industrial production of manganese. In addition, there are calcium disulfate method and bacterial leaching method.
Second, manganese oxide ore beneficiation method and process
Manganese minerals in manganese oxide ore are mainly hard manganese ore, pyrolusite and manganese ore. The gangue minerals are mainly silicate minerals, but also carbonate minerals, often accompanied by iron, phosphorus, nickel and cobalt . The ore dressing method of manganese oxide ore is mainly based on re-election. Weathered manganese oxide ore often contains a large amount of slime and fine ore, and the washing and re-election method is adopted in production. The ore mine is washed ore to remove the net minerals obtained from the slime, and some can be used as finished ore, and some need to be selected by jigging and shaker. Washing overflows sometimes require further recovery by re-election or strong magnetic separation. Some deposits of primary manganese oxide ore, due to the depletion of mining, the use of heavy medium and jigging to remove the gangue to obtain a massive concentrate.
In iron-bearing manganese oxide ore, the iron mineral is mainly limonite. Iron and manganese are difficult to separate by re-election, flotation or strong magnetic separation, and a reduction roasting magnetic separation method is required. A washing-reduction roasting magnetic separation-re-election process has been employed in the industry.
First, manganese carbonate ore beneficiation process and method